What is Sudden Cardiac Death (SCD)?

Sudden Cardiac Death (SCD) is characterized as an unexpected loss of heart function, particularly emphasizing the increased risk that can occur during physical activity. This phenomenon often arises from lethal arrhythmias that can disrupt the heart's normal rhythm and lead to immediate cardiac arrest, particularly in individuals who may have underlying heart conditions that are not previously diagnosed.

During activities that elevate heart rate, the stress placed on the cardiovascular system can trigger these dangerous rhythms, leading to an abrupt loss of function. While the other options touch upon important aspects related to heart health, they do not accurately encapsulate the immediate and acute nature of SCD, which primarily refers to its sudden onset often exacerbated by physical exertion. Understanding the risk factors associated with SCD is essential, especially for individuals who may engage in vigorous activities without realizing they have underlying heart issues.